Alex Nistico ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiNzdhMDUxNWQz... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16490?atlOrigin=eyJpIjoiNzdhMD... ) HHH-16490 ( https://hibernate.atlassian.net/browse/HHH-16490?atlOrigin=eyJpIjoiNzdhMD... ) The discriminator type mapper overrides any custom type specfied for a field mapped over the same column ( https://hibernate.atlassian.net/browse/HHH-16490?atlOrigin=eyJpIjoiNzdhMD... ) Issue Type: Bug Affects Versions: 6.1.7, 6.2.1 Assignee: Unassigned Components: hibernate-core Created: 18/Apr/2023 18:08 PM Environment: Hibernate 6.1.7 and 6.2.1 Java 17 Postgres 13 Priority: Major Reporter: Alex Nistico ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) If an entity maps a field and the discriminator on the same column, the entity persister tries to use the same value persister for both the discriminator and the field, which causes problems if the field is mapped using a different type. A simplified example of the situation is: @Entity @Inheritance(strategy = SINGLE_TABLE) @DiscriminatorColumn(name = "code") public abstract class MarketValue { @Id @GeneratedValue(strategy = AUTO) private final Long id; @Column(nullable = false, insertable = false, updatable = false) private final MarketId code; .... } Where MarketId has a JavaType registered in the type contributions. If I try do read an instance from the database I get the following exception: Caused by: java.lang.IllegalArgumentException: Can not set final com.example.demo.model.MarketId field com.example.demo.model.MarketValue.code to java.lang.String at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167) ~[na:na] at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171) ~[na:na] at java.base/jdk.internal.reflect.UnsafeQualifiedObjectFieldAccessorImpl.set(UnsafeQualifiedObjectFieldAccessorImpl.java:83) ~[na:na] at java.base/java.lang.reflect.Field.set(Field.java:799) ~[na:na] at org.hibernate.property.access.spi.SetterFieldImpl.set(SetterFieldImpl.java:53) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final] ... 103 common frames omitted ( https://hibernate.atlassian.net/browse/HHH-16490#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16490#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100222- sha1:c08beee )